Roof insulation

Roof Insulation Roundup

A Comprehensive Comparison of the Best Types for Maximum Comfort

Roof insulation is frequently disregarded when it comes to home insulation, yet it's essential for keeping a cozy, energy-efficient home. In this article, we delve into the world of roof insulation and explore the various types available, including batt insulation, blown-in insulation, and spray foam insulation. We also look at each type's advantages, such as its durability, insulating capabilities, and environmental effects. After reading this thorough comparison, you'll know more about the many kinds of roof insulation and be better prepared to choose one for your house.

Roof insulation is a topic that most people don't give much thought to. But, choosing the ideal insulation for your house strategically may keep you comfortable while also saving you money. The Environmental Protection Agency estimates that by adequately insulating their home, the average homeowner can save 15% yearly on their power costs.

There are various types of insulation to take into account if you're building a new house or looking to improve the insulation in your existing one. The optimum type of insulation for your home will depend on a number of variables, including where you live, your spending limit, and any existing insulation you intend to keep.

R-Values in Roof Insulation: An Overview

The R-Value measures the efficiency with which insulation prevents heat from passing through it, keeping heat inside your home on cold days and outside on hot days. R-Values below R30 fall on the extreme end of the spectrum for insulation. You would prefer an R-Value closer to R60 for maximum insulation.

Energy Star offers a map that illustrates the recommended R-Value for insulation that shows what type of insulation is ideal for each geographic area. For instance, it is advised that Florida homeowners install insulation with an R-Value as low as R30. On the other hand, Minnesotans living in the north should use insulation with a minimum R-Value of 49.

If you are putting new insulation on top of existing insulation, as indicated on the Energy Star map, you might be able to utilize insulation with a lower R-Value.

Best Roof Insulation Options

Foam Insulation Spray

When using spray foam insulation, the underside of the roof deck, slates, and tiles are equally coated with a polyurethane or latex spray. This not only offers insulation but also seals fractures and prevents moisture from entering the house. It can be utilised for complete insulation or in specific locations that are vulnerable to moisture buildup. It would be at the higher end of the price range for insulation, with possible expenses of $10,000, if used to insulate an entire attic area.


More endurable than fiberglass

Closes gaps and resists moisture

High R-value insulation is effective


Pricier than blown-in insulation or fiberglass insulation

Must be installed by a professional

Batt Insulation

Batt blanket insulation is a widely used kind of insulation that is comprised of fiberglass and is reasonably easy to install on your own. Rolls of batt insulation are available in various lengths and R-Values. Although the insulation can be trimmed to fit around rafters and ceiling joists, spray foam insulation offers a better seal. With typical expenses between $500 to $1,500, it is a good low-cost choice.


Simple to buy and setup yourself




Low R-Value results in less energy efficiency

For the best insulation, many layers could be needed.

Installation could cause skin, eye, and lung irritation.

Insulation that is loose-fill or blown in

For filling a big space, such an attic or crawl space, loose-fill or blown-in insulation made of fiberglass, cellulose, or recycled materials is an excellent choice. A flexible tube can be used to blast it into the area, making it possible to insulate a confined space. The total insulation is something you can pretty much regulate, which might help you get the proper amount for your environment. The average price is between $1,750 and $5,550.

While not being flammable, fiberglass insulation does not perform as well in cold regions. Although flammable, cellulose insulation is more resilient than fiberglass and is a better choice for colder areas.


Relative to R-Value

May fit in tight spaces or take up more room DIY-possible Drawbacks:


Installation requires using safety precautions

Can lose air over time and hold moisture

Structural Insulated Panels

SIPs, also known as structural insulated panels, have stiff insulation placed between two sheets of plywood. However , they are a popular and long-lasting option to include when building a home, making them challenging to retrofit into existing homes. On average, they cost $10 to $12 per square foot. SIPs can significantly lower energy expenses when installed correctly.


Supports weight (up to 70lbs per square foot)

Energy-efficient and reduces the cost of utilities

Custom sizes and shapes are available.


Must be installed by a professional

Installation is best done during construction, not after.

Moisture must be avoided.

Boards for rigid insulation

Extruded polystyrene (XPS) or expanded polystyrene, often known as rigid board insulation, is more frequently used to insulate walls in living rooms than attics (EPS). The rigid insulation board's material will impact both the cost and the R-Value; generally speaking, the greater the R-Value, the more expensive the rigid insulation board. The typical price is between $4000 and $15500.


Getting a high R-Value is possible

DIY-friendly in the appropriate setting



Not the best choice for attic insulation.

Installing it in huge spaces is expensive.

Generally, fire retardant chemicals are used, which could be harmful to your health.

What to Check for in Roof Insulation

There are a few things to think about when insulating your house. Your home's R-value can be used to determine how well insulation prevents heat from passing through it. The optimum kind of insulation to use is the next question. The greatest choice is to decide if you will DIY the project or hire a professional.